Battery Accesories for 30lb trolling motor that draws 12V and 30amps.

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  • Updated 3 years ago
  • (Edited)
Hi, Case Canoe is a start up motorized canoe company. We are using a 30lb trolling motor that draws 12V and 30amps. Do you have power accessories that would power this motor for 4-10 hours?

We also use a solar panel to extend the life of the battery. Do you have a simple way of adding this component to the power system?
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Alexander Case

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Posted 3 years ago

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Ken, Champion

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Ego doesn't make anything like that. They make 56-volt batteries for their own tools and that's it.
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Jacob

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But we need hobby kits!!!!!!!!! This seems like an easy thing to make using a motor from a 15" trimmer. Run controls up top. Run 5 solar panels in series giving 60v. Sounds simple enough to me.
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Adrian Ramirez

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You could wire a 12V buck converter off the Ego battery and power the trolling motor from that. 30A is a lot though, might need 2 or 3 converters in parallel. And something to cut power when the Ego battery is dead. Charging a li-ion battery is a lot more complicated. I'm not sure if you can find an off the shelf DC-DC charger for a 14 series cell li-ion battery.


Well, a Maccor can probably do it, but those are huge and cost 10's to 100's of thousands of dollars.
(Edited)
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Adrian Ramirez

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Oh, you said, "to extend the life of the battery." In that case you could probably wire 12V solar panels in parallel with the 12V buck converter. It won't charge the battery (hopefully), but the load would share the power supplies from the converter and the solar panels. I doubt the solar panels would help that much though, unless they were really large and in full sunlight.
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Jacob

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I'm working on a circuit to kill the battery when it gets to the minimum voltage. Any suggestions?
(Edited)
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Adrian Ramirez

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You might be able to find an off the shelf solution on Amazon or eBay. Search for under voltage protection. You will want to cut the ego battery off around 42V to 45V. The higher you cut off, the longer storage time you will have before you need to recharge. Check the current draw of the under-voltage circuit after it latches off. Something in the micro-amps would be nice if that exists. I've seen some as high as 10 mA, which is really high and almost defeats the purpose of having a auto-cut off if it's going to suck that much current afterword.

You could also make a simple under-voltage cutoff circuit with a comparator that switches an N-channel MOSFET. That could easily take as little as a few micro amps when switched off. Comparators can be very low power. But you might need to divide down the voltage for the comparator circuit because they usually can't take more than about 10V or so.
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Blue Angel, Champion

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Alexander, Ego's largest battery would only power that motor for about an hour (7.5Ah). There's a larger backpack battery in the works, but it's not yet available.

Residential solar panels are large, but a single panel can generate in excess of 300W. On a sunny day that panel could go a long way to powering your 360W application, but it would have to be mounted off the end of the canoe.

These panels are often available for much less $/W than the typical 12V battery charging panels we see in stores. Might be worth looking into?
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Jennifer VandeWater, Community Manager

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Hi Alexander, we've changed your question to an idea to keep track of it for the future. We don't make anything like you've described at the moment but we'll keep everyone posted if this is something we get into in the future.
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Steve Claflin

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Modified blower